<!DOCTYPE html >
<html xmlns="http://www.w3.org/1999/xhtml">
<head lang="en">
    <meta charset="UTF-8" http-equiv="X-UA-Compatible" content="IE=Edge"/>
    <title>hello</title>
    <style>
        #hhh {

        }

        #lyf {
            border-color: #fff6de;
            position: fixed;
            background-color: #fff6de;
            box-shadow: 3px 3px 6px 0px #3b5998 ;
            margin: auto;
            float: right;
            right: 10px;
            top: 0;
            bottom: 0;
        }
        div{
            border-style: solid;
            border-width: 1px;
            width: 100px;
            height: 100px;
        }
    </style>

</head>

<body class="app postion">
<div style="width: 500px;height: 500px;">


    <div>bbb</div>
    <div style="position: absolute;">
        ccc
    </div>

</div>
</body>
</html>